Another thought would be the Home-away-from-home resorts. There you can get a two bedroom, with full kitchen and laundry in the unit. You can get them at AP discounts, or better yet, rent points from a DVC member (on the DVC Rent/Trade board) and get it much cheaper. Things get pricy on weekends, but all that space is just magnificent. OKW is the largest and probly cheapest to book, then there's SSR, and DVC resorts attached to BC, BW and WL (we stay at BWV and it suits family and friends fine - 6 in the unit this time).
Perhaps that is an idea for another time tho. From the original post it seems that two rooms at a Value resort should do best. See if you can get connecting rooms, and make it into a quasi-suite that way. Once you do the DVC resorts you'll be spoiled by the deluxe accommodations at Moderate prices.
Good luck, and have a great time!